Cutter blade lock



April 18, 1950 E. GAIRING 2,504,192

CUTTER BLADE LOCK Filed Oct. 21, 1947 2 Sheets-Sheet 1 f 9 I IJNVENTOR.

Filed 001;. 21, 1947 v 2 Sheets-Sheet 2 v I {NVENTOR- 35 i Patented Apr. 18, 1950 STATES PATENT CUTTER BLADE LOCK endea in Benoit M ch- Application October ;21, 1947, Serial No. 781,077

(Cl. :22- .Q;)

f1 Gltt ms.

invention relates to an insertable blade cutter body having .slots accurately machined to width-and of a uniform distance from the center of the cutter to receive the flat surfaces of the cutting blades at the bottom and rear wall of said body; the slots of said body having integral extended lugs to give maximum support the full length of the blades adjacent to the lock-' wedge and bottom .of the slot.

"The-same 'bladesare used for all sizes of cutter bodies, and are separately adapted for replacements. The bladesare of the tool-bit type, hav- "ing :a compound angle at the rear of the tipped section which ecu-ordinates with a draw-down holding wedge provided with matching angles which hold the blade firmly against the bottom "and rear wall of the slots in the body, thereby preventing the blade from moving laterally under cutting pressure.

The blades are interchangeable, the assembled cutter need not be placed in'a'cutter grinder for sharpening, as the blades may be ground individually when required or necessary.

The insertion of the blades are made by hand a-ndthey are held in place'by tightening the lock screw.

when the cutter is set up in the machine the blades may be lined up against the cut in the work; or the cutter maybe placed face down on :a surface plate, with the ground facesof thelugs adjacent to the blades resting on a'bushing.

In either case-the blades are inserted by hand, pushed .down, and the locks tightened.

The same locks are used for a sizes of blades assembled in the cutter body, and they remained attached to the cutter-"body, when changing "blades.

The locking mechanism comprises a wedge and a screw bolt held together by a U-shaped clip as shown in the accompanying drawings, thus providing a unitary device, hereinafter described in further detail.

In the drawings Figure l is a fragmentary perspective view of the front of the cutter indicating two blades in place, and one blade removed, to show a rectangular slot to receive and engage the blade and the wedge together, the view also shows the extended supporting lugs on the body for additional rigidity.

Figure 2 is a fragmentary perspective view of the back of the cutter showing the blades and wedges lodged in the rectangular slots in the body and held in place by the draw-down bolts;

:azlsozthe compoundangle on the' blades and wedges torpreventmovement when iii-operation.

:Figure 13 is a vfragmentary cross-sectional view through othe cutter, :taken .on line 3-=-3, .of Figure Lshowing-oneof the extended lugs.

:Figure 4 is a perspective =view :of an aassembl ofseverad parts, comprising .the bladethe wedge, ;a 'screwa'threaded molding :bolt, :and also a U- shaped retaining clip encircling the :holding bolt, secured .to the wedge.

Figure i5 vis .a perspective view :of lthewwedgee with :the :holding aboltremoved rshowing a ,counterbore for the bolt-head provided in th'ewedge, and also the U-shaped clip securedatothe wedge.

-Eigure 6 .is ;-a .crossesectional :view :of the wedge, --:the :holding :bolt, and :the clip; showin :the emgaging :angle on the :underside :of zthe head .of

the bolt, :and :also'the :angle on thetcountecbored on the front face of the blade where the blade -:engages thelocking 'wedgefboth angles ta-pering from the same position on the base of-the "blade as-shown in Figured; the wedge-is-provided "with corresponding angles 'to engage the blade I when'held in place bythe draw-downbolt.

Figure' 9 :is a 'cross-sec-tionalview of the locking awedge, I taken on line ll-"9 of Figure 5 showing the "counter-bore formed in the: wedgetoreceive the head of the bolt, and also the U-shaped clip, secured to the wedge.

Referring now to the letters of reference on the drawings; A, denotes the cutter-body, having slots A, of uniform distance from the center of the cutter-body to receive the fiat surface of the blades B.

The blades B, are flat on the bottom, and sides adjacent to the locking wedges and are used for all sizes of cutter bodies, and being interchangeable, the assembled cutter need not be placed in a cutter grinder for sharpening, as the blades may be individually ground on an ordinary wet carbide grinder.

The insertion of the blades in the cutter body are made by hand, and they are held in place by the adjustment of a draw-down locking screw the wedge and bolt being held firmly together when locked in the cutter-body. A collar C on the bolt serves upon contactin the wedge D, to lift the wedge from the cutter body when required, or necessary.

The lugs F, extend outwardly from the cutter- -body A, adjacent to the rectangular slots A, to-

:add additional rigidity to the blade.

The wedges D,are recessed to receive the heads of the draw-down bolts C, and have an inclined face adapted to contact the angles of the rear portion of the blade B,-to force the blade into llocked relation with the wall of the cutter body.

The upstanding angular wall D at the bottom rof the counterbored socket of the wedge, see Fig- :ures 5 and 6, upon the entry of the bolt head C in the socket of the wedge, co-ordinates with the angular wall C formed on the underside of the bolt head, to insure the wedge and bolt being firmly secured together, upon a rotary adjustment of the bolt.

What I claim is:

l. A fastener for detachably securing a blade to a cutter head, said fastener comprising a wedge having a sloping side face for contacting an inclined wall of a cutter blade to be secured, said wedge being formed with a socket having an inclined upstanding cone-shaped bottom adapted to receive the head of a pull-down bolt; and a draw-down bolt adapted for screw-threaded connection with a cutter body, the head ofsaid bolt having a cone-shaped recess on its underside face,

to receive and coordinate with the inclined walls of the socket of the wedge and hold the head in concentric relation to the socket.

2. A fastener of the character described comprising a wedge having upper and lower faces and .side faces, one side face extending at an incline between the upper and lower faces and the other .side face being formed with a vertical recess and a socket about the upper end of the recess, a draw- -down screw rotatably. fitting in the recess and having at its upper end a turning head rotatably fitting into said socket in countersunk relation to the upper face of the wedge, a collar surrounding said screw and spaced downwardly from the head and overlapping the lower face of the wedge and serving to force the wedge upwardly to a releasing position when the screw is loosened, the bottom of said socket being cone-shaped and the head of the screw having a cone-shaped recess in its under face in which the cone-shaped bottom of the socket fits, and a U-shaped clip detachably carried by and projecting laterally from the wedge in straddling relation to the recess and fitting loosely about the portion of the screw between the head and the collar and holding the wedge in connection with the screw.

' 3. A fastener comprising a wedge having upper and lower faces and side faces, one side face extending at an incline between the upper and lower faces of the wedge, a draw-down screw at the opposite side ofthe wedge from the inclined side face thereof having a turning head overlapping the adjoining side portion of the wedge and serving to force the wedge downwardly to a gripping position when the screw is tightened, a collar about said screw spaced downwardly from the head and overlapped by the wedge and serving to force the wedge upwardly to a releasing position when the screw is loosened and a member carried by said wedge and loosely engaged about the screw between the head and the collar and holding the wedge in connection with the screw.

4. A fastener comprising a wedge having upper and lower faces and side faces, one side face extending at an incline between the upper and lower faces of the wedge, a draw-down screw at the opposite side of the wedge from the inclined side face thereof having a turning head at its upper end, said wedge being formed with a recess into which the head of the screw fits and serves to force the wedge downwardly to a gripping position when the screw is tightened, a collar about said screw rigid therewith and spaced downwardly from the head and overlapping the lower face of the wedge and serving to force the wedge upwardlyv to a releasing position when the screw is loosened, and a U-shaped clip carried by said wedge and fitting loosely about the portion of the screw between the head and the collar and holding the wedge in connection with the screw.

EMIL GAIRING.

REFERENCES CITED The following references are of record in th file of this patent:

UNITED STATES PATENTS 

